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When its cold they'll stay closed once they close. The car will reopen them only if it needs the additional cooling.
 

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At highway speed, set your cruise control, then climb out your window and crawl on your hood and dip your head over the front end and take a gander through the lower grill, it should be closed...
This. Selfie or it didn't happen. :D
 

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I'll just leave this here.

 

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If the shutters aren't operating correctly a check engine light will set.

Rob
Looking at a 2018+ OEM wiring diagram, I came across a LIN bus, it was labeled a shutter control. LIN is a two-way 1-wire communication bus, so the shutter should be reporting back it's actual position in this application. GM may also have a feedback-loop.
 
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